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9f7ef985 JO |
1 | /* |
2 | * "Optimize" a list of dependencies as spit out by gcc -MD | |
3 | * for the build framework. | |
4 | * | |
5 | * Original author: | |
6 | * Copyright 2002 by Kai Germaschewski <kai.germaschewski@gmx.de> | |
7 | * | |
8 | * This code has been borrowed from kbuild's fixdep (scripts/basic/fixdep.c), | |
9 | * Please check it for detailed explanation. This fixdep borow only the | |
10 | * base transformation of dependecies without the CONFIG mangle. | |
11 | */ | |
12 | ||
13 | #include <sys/types.h> | |
14 | #include <sys/stat.h> | |
15 | #include <sys/mman.h> | |
16 | #include <unistd.h> | |
17 | #include <fcntl.h> | |
18 | #include <string.h> | |
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | #include <limits.h> | |
22 | ||
23 | char *target; | |
24 | char *depfile; | |
25 | char *cmdline; | |
26 | ||
27 | static void usage(void) | |
28 | { | |
29 | fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n"); | |
30 | exit(1); | |
31 | } | |
32 | ||
33 | /* | |
34 | * Print out the commandline prefixed with cmd_<target filename> := | |
35 | */ | |
36 | static void print_cmdline(void) | |
37 | { | |
38 | printf("cmd_%s := %s\n\n", target, cmdline); | |
39 | } | |
40 | ||
41 | /* | |
42 | * Important: The below generated source_foo.o and deps_foo.o variable | |
43 | * assignments are parsed not only by make, but also by the rather simple | |
44 | * parser in scripts/mod/sumversion.c. | |
45 | */ | |
46 | static void parse_dep_file(void *map, size_t len) | |
47 | { | |
48 | char *m = map; | |
49 | char *end = m + len; | |
50 | char *p; | |
51 | char s[PATH_MAX]; | |
52 | int is_target; | |
53 | int saw_any_target = 0; | |
54 | int is_first_dep = 0; | |
55 | ||
56 | while (m < end) { | |
57 | /* Skip any "white space" */ | |
58 | while (m < end && (*m == ' ' || *m == '\\' || *m == '\n')) | |
59 | m++; | |
60 | /* Find next "white space" */ | |
61 | p = m; | |
62 | while (p < end && *p != ' ' && *p != '\\' && *p != '\n') | |
63 | p++; | |
64 | /* Is the token we found a target name? */ | |
65 | is_target = (*(p-1) == ':'); | |
66 | /* Don't write any target names into the dependency file */ | |
67 | if (is_target) { | |
68 | /* The /next/ file is the first dependency */ | |
69 | is_first_dep = 1; | |
70 | } else { | |
71 | /* Save this token/filename */ | |
72 | memcpy(s, m, p-m); | |
73 | s[p - m] = 0; | |
74 | ||
75 | /* | |
76 | * Do not list the source file as dependency, | |
77 | * so that kbuild is not confused if a .c file | |
78 | * is rewritten into .S or vice versa. Storing | |
79 | * it in source_* is needed for modpost to | |
80 | * compute srcversions. | |
81 | */ | |
82 | if (is_first_dep) { | |
83 | /* | |
84 | * If processing the concatenation of | |
85 | * multiple dependency files, only | |
86 | * process the first target name, which | |
87 | * will be the original source name, | |
88 | * and ignore any other target names, | |
89 | * which will be intermediate temporary | |
90 | * files. | |
91 | */ | |
92 | if (!saw_any_target) { | |
93 | saw_any_target = 1; | |
94 | printf("source_%s := %s\n\n", | |
95 | target, s); | |
96 | printf("deps_%s := \\\n", | |
97 | target); | |
98 | } | |
99 | is_first_dep = 0; | |
100 | } else | |
101 | printf(" %s \\\n", s); | |
102 | } | |
103 | /* | |
104 | * Start searching for next token immediately after the first | |
105 | * "whitespace" character that follows this token. | |
106 | */ | |
107 | m = p + 1; | |
108 | } | |
109 | ||
110 | if (!saw_any_target) { | |
111 | fprintf(stderr, "fixdep: parse error; no targets found\n"); | |
112 | exit(1); | |
113 | } | |
114 | ||
115 | printf("\n%s: $(deps_%s)\n\n", target, target); | |
116 | printf("$(deps_%s):\n", target); | |
117 | } | |
118 | ||
119 | static void print_deps(void) | |
120 | { | |
121 | struct stat st; | |
122 | int fd; | |
123 | void *map; | |
124 | ||
125 | fd = open(depfile, O_RDONLY); | |
126 | if (fd < 0) { | |
127 | fprintf(stderr, "fixdep: error opening depfile: "); | |
128 | perror(depfile); | |
129 | exit(2); | |
130 | } | |
131 | if (fstat(fd, &st) < 0) { | |
132 | fprintf(stderr, "fixdep: error fstat'ing depfile: "); | |
133 | perror(depfile); | |
134 | exit(2); | |
135 | } | |
136 | if (st.st_size == 0) { | |
137 | fprintf(stderr, "fixdep: %s is empty\n", depfile); | |
138 | close(fd); | |
139 | return; | |
140 | } | |
141 | map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
142 | if ((long) map == -1) { | |
143 | perror("fixdep: mmap"); | |
144 | close(fd); | |
145 | return; | |
146 | } | |
147 | ||
148 | parse_dep_file(map, st.st_size); | |
149 | ||
150 | munmap(map, st.st_size); | |
151 | ||
152 | close(fd); | |
153 | } | |
154 | ||
155 | int main(int argc, char **argv) | |
156 | { | |
157 | if (argc != 4) | |
158 | usage(); | |
159 | ||
160 | depfile = argv[1]; | |
161 | target = argv[2]; | |
162 | cmdline = argv[3]; | |
163 | ||
164 | print_cmdline(); | |
165 | print_deps(); | |
166 | ||
167 | return 0; | |
168 | } |